This experiment begins with a flask filled mostly with air, and a few milliliter

Question

This experiment begins with a flask filled mostly with air, and a few milliliters of a liquid. At the point when the flask is removed from the hot water, what has happened to the air? What is in the flask? In this experiment, the liquid to be studied is at the bottom of the flask. Why is it important that the whole flask be immersed in the boiling water bath? It is necessary to know the volume of the flask to get the results of this experiment. What method is used to measure the volume? Two students measure molar masses of (different) unknown samples. One student obtains a value of 0.0773 g/mol, and the other obtains a value of 118A g/mol. Are each of these answers possible? Explain briefly.

Explanation / Answer

(1)

All the air has been displaced with the vapors of the volatile liquid.

(2)

This is because the vapors of the liquid get collected in the flask, and it is important that they donot condense back, so whole flask must be immersed.

(3)

After completing the experiment, the flask is rinsed with acetone and then with water to clear any remnants of the volatile liquid. Then the flask is filled upto its neck and then the amount of water it contains is measured by a 500mL measuring cylinder.

(4)

The molar mass of 0.0773 is not possible because the lowest possible molar mass if 2 grams for hydrogen gas.

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